The motivation for the third chapter is to find empirical support to justify increased rate of rural and urban migration. Here we estimate the pattern of consumption behavior of urban and rural households and look for existing differences. Using Todaro's model of expected wages for a migrant worker, we calculate the net benefit derived from rural-urban migration. Under realistic assumptions, we show that the benefit derived from immigration to cities outweighs the cost of emigration on rural economies. Therefore, from efficiency's point of view migration is a good thing and justifies the idea increased of rural-urban migration.